Granularity and adjustment accuracy in an integrated access backhaul network

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a node, such as a node in an integrated access backhaul (IAB) deployment, may receive information identifying a timing advance value and a timing assistance value, wherein the timing assistance value is associated with a configuration parameter. The node may perform a downlink transmission to a child node of the node based at least in part on the timing advance value and the timing assistance value and in accordance with the configuration parameter. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority to U.S. Provisional PatentApplication No. 62/831,018, filed on Apr. 8, 2019, entitled “GRANULARITYAND ADJUSTMENT ACCURACY IN AN INTEGRATED ACCESS BACKHAUL NETWORK,” andassigned to the assignee hereof. The disclosure of the prior applicationis considered part of and is incorporated by reference in this patentapplication.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication, and to techniques and apparatuses for granularity andadjustment accuracy in an integrated access backhaul network.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by anode, may include receiving information identifying a timing advancevalue and a timing assistance value, wherein the timing assistance valueis associated with a configuration parameter, wherein the configurationparameter comprises at least one of a granularity parameter or anaccuracy parameter; and performing a downlink transmission to a childnode of the node based at least in part on the timing advance value andthe timing assistance value and in accordance with the configurationparameter.

In some aspects, a node for wireless communication may include memoryand one or more processors operatively coupled to the memory. The memoryand the one or more processors may be configured to receive informationidentifying a timing advance value and a timing assistance value,wherein the timing assistance value is associated with a configurationparameter, wherein the configuration parameter comprises at least one ofa granularity parameter or an accuracy parameter; and perform a downlinktransmission to a child node of the node based at least in part on thetiming advance value and the timing assistance value and in accordancewith the configuration parameter.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a node, maycause the one or more processors to: receive information identifying atiming advance value and a timing assistance value, wherein the timingassistance value is associated with a configuration parameter, whereinthe configuration parameter comprises at least one of a granularityparameter or an accuracy parameter; and perform a downlink transmissionto a child node of the node based at least in part on the timing advancevalue and the timing assistance value and in accordance with theconfiguration parameter.

In some aspects, an apparatus for wireless communication may includemeans for receiving information identifying a timing advance value and atiming assistance value, wherein the timing assistance value isassociated with a configuration parameter, wherein the configurationparameter comprises at least one of a granularity parameter or anaccuracy parameter; and means for performing a downlink transmission toa child node of the apparatus based at least in part on the timingadvance value and the timing assistance value and in accordance with theconfiguration parameter.

In some aspects, a method of wireless communication, performed by aparent node, may include determining a configuration parameter for atiming assistance value, wherein the configuration parameter comprises agranularity parameter; and transmitting, to a node, informationidentifying the timing assistance value based at least in part on theconfiguration parameter.

In some aspects, a parent node for wireless communication may includememory and one or more processors operatively coupled to the memory. Thememory and the one or more processors may be configured to determine aconfiguration parameter for a timing assistance value, wherein theconfiguration parameter comprises a granularity parameter; and transmit,to a node, information identifying the timing assistance value based atleast in part on the configuration parameter.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a parent node,may cause the one or more processors to: determine a configurationparameter for a timing assistance value, wherein the configurationparameter comprises a granularity parameter; and transmit, to a node,information identifying the timing assistance value based at least inpart on the configuration parameter.

In some aspects, an apparatus for wireless communication may includemeans for determining a configuration parameter for a timing assistancevalue, wherein the configuration parameter comprises a granularityparameter; and means for transmitting, to a node, informationidentifying the timing assistance value based at least in part on theconfiguration parameter.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and processing system assubstantially described with reference to and as illustrated by thedrawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a UE in a wireless communication network,in accordance with various aspects of the present disclosure.

FIG. 3 is a diagram illustrating examples of radio access networks, inaccordance with various aspects of the disclosure.

FIG. 4 is a diagram illustrating an example of an integrated access andbackhaul (IAB) network architecture, in accordance with various aspectsof the disclosure.

FIG. 5 is a diagram illustrating an example of timing adjustment in amulti-hop integrated access backhaul network using a granularityparameter and/or an accuracy parameter, in accordance with variousaspects of the present disclosure.

FIG. 6 is a diagram illustrating an example process performed, forexample, by a node of an integrated access backhaul network, inaccordance with various aspects of the present disclosure.

FIG. 7 is a diagram illustrating an example process performed, forexample, by a node of an integrated access backhaul network, inaccordance with various aspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. ABS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. ABS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, and/or the like. A frequency mayalso be referred to as a carrier, a frequency channel, and/or the like.Each frequency may support a single RAT in a given geographic area inorder to avoid interference between wireless networks of different RATs.In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with granularity and adjustment accuracy inan integrated access backhaul network, as described in more detailelsewhere herein. For example, controller/processor 240 of base station110, controller/processor 280 of UE 120, and/or any other component(s)of FIG. 2 may perform or direct operations of, for example, process 600of FIG. 6 and/or other processes as described herein. Memories 242 and282 may store data and program codes for base station 110 and UE 120,respectively. A scheduler 246 may schedule UEs for data transmission onthe downlink and/or uplink.

In some aspects, a node (e.g., UE 120, BS 110, or another node describedherein, such as a node of an IAB deployment) may include means forreceiving information identifying a timing advance value and a timingassistance value, wherein the timing assistance value is associated witha configuration parameter, wherein the configuration parameter comprisesat least one of a granularity parameter or an accuracy parameter; meansfor performing a downlink transmission to a child node of the node basedat least in part on the timing advance value and the timing assistancevalue and in accordance with the configuration parameter; means fordetermining the accuracy parameter before performing the downlinktransmission; means for determining the granularity parameter beforeperforming the downlink transmission; means for transmitting, to aparent node from which the timing advance value and the timingassistance value are received, information identifying the subcarrierspacing of the communication link between the node and the child node;and/or the like. In some aspects, such means may include one or morecomponents of UE 120 or base station 110 described in connection withFIG. 2.

In some aspects, a parent node (e.g., UE 120, BS 110, or another nodedescribed herein, such as a parent node of an IAB deployment) mayinclude means for determining a configuration parameter for a timingassistance value; means for transmitting, to a node, informationidentifying the timing assistance value based at least in part on theconfiguration parameter; means for receiving information regarding acommunication link between the node and a child node of the node; meansfor transmitting, to the node, information identifying a timing advancevalue; and/or the like. In some aspects, such means may include one ormore components of UE 120 or base station 110 described in connectionwith FIG. 2.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2.

FIG. 3 is a diagram illustrating examples 300 of radio access networks,in accordance with various aspects of the disclosure.

As shown by reference number 305, a traditional (e.g., 3G, 4G, LTE,and/or the like) radio access network may include multiple base stations310 (e.g., access nodes (AN)), where each base station 310 communicateswith a core network via a wired backhaul link 315, such as a fiberconnection. A base station 310 may communicate with a UE 320 via anaccess link 325, which may be a wireless link. In some aspects, a basestation 310 shown in FIG. 3 may be a base station 110 shown in FIG. 1.In some aspects, a UE 320 shown in FIG. 3 may be a UE 120 shown in FIG.1.

As shown by reference number 330, a radio access network may include awireless backhaul network, sometimes referred to as an integrated accessand backhaul (IAB) network. In an IAB network, at least one base stationis an anchor base station 335 that communicates with a core network viaa wired backhaul link 340, such as a fiber connection. An anchor basestation 335 may also be referred to as an IAB donor (or IAB-donor). TheIAB network may include one or more non-anchor base stations 345,sometimes referred to as relay base stations or IAB nodes (e.g.,IAB-nodes). The non-anchor base station 345 may communicate directly orindirectly with the anchor base station 335 via one or more backhaullinks 350 (e.g., via one or more non-anchor base stations 345) to form abackhaul path to the core network for carrying backhaul traffic.Backhaul link 350 may be a wireless link. Anchor base station(s) 335and/or non-anchor base station(s) 345 may communicate with one or moreUEs 355 via access links 360, which may be wireless links for carryingaccess traffic. In some aspects, an anchor base station 335 and/or anon-anchor base station 345 shown in FIG. 3 may be a base station 110shown in FIG. 1. In some aspects, a UE 355 shown in FIG. 3 may be a UE120 shown in FIG. 1.

As shown by reference number 365, in some aspects, a radio accessnetwork that includes an IAB network may utilize millimeter wavetechnology and/or directional communications (e.g., beamforming and/orthe like) for communications between base stations and/or UEs (e.g.,between two base stations, between two UEs, and/or between a basestation and a UE). For example, wireless backhaul links 370 between basestations may use millimeter wave signals to carry information and/or maybe directed toward a target base station using beamforming and/or thelike. Similarly, the wireless access links 375 between a UE and a basestation may use millimeter wave signals and/or may be directed toward atarget wireless node (e.g., a UE and/or a base station). In this way,inter-link interference may be reduced.

The configuration of base stations and UEs in FIG. 3 is shown as anexample, and other examples are possible. For example, one or more basestations illustrated in FIG. 3 may be replaced by one or more UEs thatcommunicate via a UE-to-UE access network (e.g., a peer-to-peer network,a device-to-device network, and/or the like). In this case, an anchornode may refer to a UE that is directly in communication with a basestation (e.g., an anchor base station or a non-anchor base station).

As indicated above, FIG. 3 is provided as an example. Other examples arepossible and may differ from what was described with regard to FIG. 3.

FIG. 4 is a diagram illustrating an example 400 of an integrated accessand backhaul (IAB) network architecture, in accordance with variousaspects of the disclosure.

As shown in FIG. 4, an IAB network may include anchor nodes 405, or IABdonors (shown as IAB-donor), that connect to a core network via a wiredconnection (shown as wireline). For example, an Ng interface of ananchor node 405 may terminate at a core network. Additionally, oralternatively, an anchor node 405 may connect to one or more devices ofthe core network that provide a core access and mobility managementfunction (AMF). In some aspects, an anchor node 405 may include a basestation 110, such as an anchor base station, as described above inconnection with FIG. 3. In some aspects, an anchor node 405 may beassociated with a central unit (CU) which may perform access nodecontroller (ANC) functions, AMF functions, and/or the like.

As further shown in FIG. 4, the IAB network may include non-anchor nodes410, or IAB nodes (shown as IAB-Node). A non-anchor node 410 may provideIAB functionality, and may include mobile terminal (MT) functions 415(also sometimes referred to as UE functions (UEF)) and distributed unit(DU) functions 420 (also sometimes referred to as access node functions(ANF)). The MT functions 415 may be controlled and/or scheduled byanother non-anchor node 410 and/or an anchor node 405. The DU functions420 may control and/or schedule other non-anchor nodes 410 and/or UEs425 (e.g., which may correspond to UEs 120). In some aspects, an anchornode 405 may include only DU functions 420, and not MT functions 415.That is, an anchor node 405 may control and schedule communications withnon-anchor nodes 410 and/or UEs 425. Additionally, or alternatively, aUE 425 may include only MT functions 415, and not DU functions 420. Thatis, communications of a UE 425 may be controlled and/or scheduled by ananchor node 405 and/or a non-anchor node 410.

When a first node controls and/or schedules communications for a secondnode (e.g., when the first node provides DU functions for the secondnode's MT functions), the first node may be referred to as a parent nodeof the second node, and the second node may be referred to as a childnode of the first node. A child node of the second node may be referredto as a grandchild node of the first node. Thus, a DU function 420 of aparent node may control and/or schedule communications for child nodesof the parent node. A parent node may be an anchor node 405 or anon-anchor node 410, and the child node may be a non-anchor node 410 ora UE 425. Communications of an MT function 415 of a child node may becontrolled and/or scheduled by a parent node of the child node.

As further shown in FIG. 4, a link between a UE 425 (e.g., which onlyhas MT functions 415, and not DU functions 420) and an anchor node 405or between a UE 425 and a non-anchor node 410 may be referred to as anaccess link 430. Access link 430 may be a wireless access link thatprovides a UE 425 with radio access to a core network via an anchor node405, and optionally via one or more non-anchor nodes 410. Thus, thenetwork illustrated in FIG. 4 may be referred to as a multi-hop IABnetwork.

As further shown in FIG. 4, a link between an anchor node 405 and anon-anchor node 410 or between two non-anchor nodes 410 may be referredto as a backhaul link 435. Backhaul link 435 may be a wireless backhaullink that provides a non-anchor node 410 with radio access to a corenetwork via an anchor node 405, and optionally via one or more othernon-anchor nodes 410. In some aspects, a backhaul link 435 may be aprimary backhaul link (shown as backhaul link 435) or a secondarybackhaul link 440 (e.g., a backup backhaul link). In some aspects, asecondary backhaul link 445 may be used if a primary backhaul linkfails, becomes congested, becomes overloaded, and/or the like. Somepropagation delay may be present between nodes, which may be mitigatedusing a timing advance (TA) value. Furthermore, some nodes may beassociated with switching limitations, processing limitations, and/orthe like, which may be mitigated using a timing assistance value, suchas a delta value and/or the like.

As indicated above, FIG. 4 is provided as an example. Other examples arepossible and may differ from what was described with regard to FIG. 4.

A child node may adjust an uplink transmission timing based at least inpart on a timing advance (TA) value specified by a parent node of thechild node. For example, the TA value may compensate for a delay betweenthe parent node's downlink transmission to the child node (which arrivesat the child node with some delay) and the parent node's reception ofthe child node's uplink transmission (which is presumably associatedwith a similar delay as the downlink transmission). The child node mayadvance the uplink transmission by an amount of time specified by the TAvalue so that the parent node's transmissions and receptions are alignedwith each other.

In a multi-hop IAB network, the parent node can transmit a timingassistance value (which may be referred to, in some cases, as a deltavalue) for adjustment of a downlink transmission time of the child node(e.g., a transmission time for a transmission from the child node to agrandchild node). In this case, the child node may adjust the childnode's downlink transmission time relative to the child node's downlinkreception timing using TA/2+delta. TA/2 may be used since the TA valuemay take into account parent-to-child and child-to-parent propagationdelay, so one-half of the TA value may more accurately reflectparent-to-child delay. The timing assistance value may account for, forexample, at least one of an offset between the child node's downlinktransmission and uplink reception times, a transmit-to-receive switchingtime of the child node, a hardware constraint of the parent node, aquantization error, and/or the like.

The timing assistance value may be applied by various nodes that areassociated with different configurations (e.g., different subcarrierspacings, different frequency bands, different bandwidth partbandwidths, and/or the like). Thus, it may be inefficient to use auniversal granularity value that is applicable across all nodes, since anode associated with a wide subcarrier spacing may have a more granulartiming configuration than a node associated with a narrow subcarrierspacing. Furthermore, the node may be required to adjust a downlinktransmission time in accordance with an accuracy parameter, such as anadjustment accuracy (e.g., a requirement that the node adjust thedownlink transmission timing to within a particular range of thespecified timing advance and/or timing assistance value), a transmissiontiming accuracy (e.g., a measure of the accuracy of the overall timing,such as the gap between the child node's observed transmission time andthe child node's desired transmission time). However, in view of thedifferent configurations described above, a universal approach fordetermining the accuracy parameter may be inefficient and may diminishthe accuracy of the timing adjustment procedures.

Some techniques and apparatuses described herein provide signaling anddetermination of a granularity parameter and/or an accuracy parameterfor a timing assistance value. For example, the granularity parameterand/or the accuracy parameter may be determined based at least in parton a configuration of a link between a child node (e.g., that receivesthe granularity parameter and/or the accuracy parameter from a parentnode) and a grandchild node (e.g., that is to receive a downlinktransmission from the child node), a subcarrier spacing of asynchronization signal block of the child node, a bandwidth associatedwith the child node, a frequency band (e.g., frequency range) of thelink between the child node and the grandchild node, a configuration ofthe granularity parameter and/or the accuracy parameter by a centralunit, and/or the like. In this way, efficiency of a multi-hop IABnetwork may be improved by more efficiently performing communications inview of timing differences between nodes of the multi-hop IAB network.Furthermore, by determining granularity parameters and/or accuracyparameters based at least in part on the child node and/or thegrandchild node, accuracy and efficiency of configuration of timingadvance values and timing assistance values may be improved.

The granularity parameter and the accuracy parameter are referred toherein as configuration parameters, but this should not be taken as alimiting description of the granularity parameter and the accuracyparameter. For example, the granularity parameter and the accuracyparameter can be communicated using any messaging format, such asdownlink control information, dynamic signaling, radio resource controlsignaling, a media access control control element, and/or the like.Furthermore, the granularity parameter may be determined by one or moreof the nodes described herein (e.g., a parent node, a node, a childnode, a grandchild node, etc.) based at least in part on a configurationof a communication link associated with the granularity parameter. Forexample, in some aspects, the granularity parameter may not becommunicated from one node to another.

FIG. 5 is a diagram illustrating an example 500 of timing adjustment ina multi-hop IAB network using a granularity parameter and/or an accuracyparameter, in accordance with various aspects of the present disclosure.As, shown, FIG. 5 includes a parent node 505, a node 510, and a childnode 515. Parent node 505 may include anchor node 405, non-anchor node410, DU 420, and/or the like. Node 510 may include non-anchor node 410,DU 420, and/or the like. Child node 515 may include non-anchor node 410,MT 415, DU 420, and/or the like. In some aspects, node 510 and/or childnode 515 may include an MT 415 and/or a DU 420.

As shown by reference number 520, node 510 may provide informationidentifying a downlink (DL) subcarrier spacing (SCS) (e.g., tonespacing, numerology, and/or the like) to parent node 505. The DL SCS maybe for a communication link between node 510 and child node 515. In someaspects, node 510 may provide information identifying multiple DL SCSs(e.g., for multiple links between node 510 and child node 515). In someaspects, node 510 may provide other information, such as informationindicating a frequency range of the link between node 510 and child node515 and/or the like. Parent node 505 and/or node 510 may use thisinformation to determine a timing assistance value and/or a granularityparameter associated with the timing assistance value, as described inmore detail below. It should be noted that “frequency band” is usedinterchangeably with “frequency range” herein.

As shown by reference numbers 525, parent node 505 may provideinformation identifying a timing advance (TA) value, and, as shown byreference number 530, parent node 505 may provide informationidentifying a timing assistance value. The TA value may identify a timeoffset to be used for communications between parent node 505 and node510 (e.g., a timing gap between uplink transmission timing and downlinkreception timing of node 510). The timing assistance value may identifya time offset to be used for communications from node 510 and child node515. For example, the timing assistance value may include an index valuethat indicates a timing adjustment to be applied (e.g., in addition tothe timing advance). In some aspects, the timing assistance value may beindicated by parent node 505 independently from the TA value. Forexample, the timing assistance value may be updated on an aperiodicbasis.

In some aspects, the timing assistance value may include or beassociated with information identifying a granularity parameter, such asa granularity parameter index, as shown by reference number 535. Forexample, in some cases, parent node 505 (or a CU associated with parentnode 505) may provide information indicating a granularity parameter tobe used to process the timing assistance value. In this case, parentnode 505 (or the CU) may determine the granularity parameter based atleast in part on the information identifying the DL SCS or the frequencyrange. In some aspects, node 510 may determine the granularityparameter, for example, based at least in part on the frequency range ofthe communication link between nodes 510 and 515.

As shown by reference number 540, node 510 may determine an adjustmentaccuracy parameter for the timing assistance value. The adjustmentaccuracy parameter may identify a permissible time range relative to theTA value and the timing assistance value. Node 510 may be required toadjust node 510's transmission time to within the permissible timerange. For example, the adjustment accuracy may be expressed as±N*T_(c), wherein T_(c) is a timing unit (e.g., a physical layer timingunit, a sample time, and/or the like) and N is an integer. As shown,node 510 may determine the adjustment accuracy parameter based at leastin part on the DL SCS of the link with the child node. For example, node510 may determine the adjustment accuracy parameter based at least inpart on information that identifies a mapping between SCSs andcorresponding adjustment accuracies. In some aspects, a wider SCS may beassociated with a shorter permissible time range, and a narrower SCS maybe associated with a longer permissible time range, although otherapproaches may be used. In some aspects, node 510 may determine theadjustment accuracy parameter using another parameter in addition to oras an alternative to the DL SCS, such as a bandwidth of a bandwidth part(BWP) between node 510 and child node 515, a frequency range of the linkbetween node 510 and child node 515, and/or the like.

As shown by reference number 545, node 510 may determine a transmission(Tx) timing accuracy parameter based at least in part on an SCS of asynchronization signal block (SSB) received from parent node 505, andbased at least in part on the DL SCS of the link with child node 515.The transmission timing accuracy parameter may identify a requirementregarding the accuracy of the overall timing of the downlinktransmission of node 510, such a timing error limit value thatidentifies a required accuracy of the gap between node 510's observedtransmission time and node 510's desired transmission time. Node 510 maydetermine the transmission timing accuracy parameter based at least inpart on the SCS of the SSB received from parent node 505 (since the SCSof the SSB received from parent node 505 may indicate an expected errorin the timing of the SSB) and the DL SCS of the link with between node510 and child node 515 (since the DL SCS may indicate an expected errorin the timing of the DL transmission). In some aspects, node 510 maydetermine the transmission timing accuracy parameter based at least inpart on information indicating a relationship between the SCS of theSSB, the DL SCS, and the transmission timing accuracy parameter. In someaspects, node 510 may determine the transmission timing parameter usinganother parameter in addition to or as an alternative to the DL SCS,such as a bandwidth of a bandwidth part (BWP) between node 510 and childnode 515, a frequency range of the link between node 510 and child node515, and/or the like.

As shown by reference number 550, node 510 may determine a granularityparameter for the timing assistance value. For example, node 510 maydetermine the granularity parameter in order to identify a timing offsetcorresponding to a TA value and/or a timing assistance value receivedfrom node 510. More particularly, node 510 may input the granularityparameter to an equation that identifies a mapping between granularityparameters, timing assistance values, and corresponding time offsets.

In some aspects, node 510 may determine the granularity parameter basedat least in part on the DL SCS of the link between node 510 and childnode 515. For example, node 510 may use the DL SCS as the granularityparameter, or may determine the granularity parameter based at least inpart on information identifying DL SCSs and corresponding granularityparameters. This may conserve resources of a CU, parent node 505, and/orthe like, that would otherwise be used to signal the granularity.Additionally, or alternatively, node 510 may determine the granularityparameter based at least in part on another parameter, such as abandwidth of a bandwidth part between node 510 and child node 515, afrequency range of the link between node 510 and child node 515 (e.g.,based at least in part on information identifying frequency ranges andcorresponding granularity parameters), and/or the like.

In some aspects, node 510 may determine the granularity parameter basedat least in part on signaling from parent node 505, a CU, and/or thelike. For example, parent node 505 or the CU may transmit informationidentifying the granularity parameter. In some aspects, parent node 505or the CU may determine the granularity parameter, for example, usingthe information identifying the DL SCS described in connection withreference number 520, above. In the case when node 510 is associatedwith multiple bandwidth parts between node 510 and child node 515,parent node 505 and/or the CU may provide information identifying arespective granularity parameter for each bandwidth part of the multiplebandwidth parts (e.g., based at least in part on information identifyingrespective SCSs and/or frequency ranges of the multiple bandwidthparts), or may determine a single granularity parameter based at leastin part on information associated with each bandwidth part, as describedin more detail below.

In some aspects, when node 510 is associated with multiple bandwidthparts, node 510 may determine a granularity parameter based at least inpart on information associated with the multiple bandwidth parts. Insuch a case, the granularity parameter for a link may be fixed for afrequency band (e.g., frequency range) of the link. In this case, whendifferent links are associated with different frequency bands, node 510may select the granularity parameter of a frequency band with a highestDL SCS for child node 515. For example, if frequency band FR1 has agranularity parameter of A and is associated with a bandwidth parthaving a DL SCS of 60 kHz, and if frequency band FR2 has a granularityparameter of B and is associated with a bandwidth part having a DL SCSof 240 kHz, then node 510 (or parent node 505, or the CU) may select thegranularity parameter of B. In some aspects, node 510 may apply theabove approach when node 510 has not received an explicit indication ofthe granularity parameter from parent node 505 or the CU. In someaspects, node 510 may select a granularity parameter in accordance witha lowest SCS and/or the like.

In some aspects, if the timing assistance value is determined inaccordance with a maximum DL SCS, and if node 510 is using a lower DLSCS than the maximum DL SCS, then parent node 505 may round the timingassistance value to a granular point (e.g., a nearest higher granularpoint, a nearest lower granular point, etc.) in accordance with agranularity parameter corresponding to the lower DL SCS. Thus,compatibility for bandwidth parts with lower DL SCSs may be preservedwhen the timing assistance value is determined in accordance with themaximum DL SCS.

As shown by reference number 555, node 510 may transmit a DLtransmission to child node 515 using the timing assistance value and theTA value. For example, node 510 may transmit the DL transmission using atime offset of TA/2 plus the timing assistance value. Node 510 maydetermine the time offset in accordance with the adjustment accuracyparameter and the transmission timing accuracy parameter, and mayinterpret the timing assistance value, using the granularity parameter,to determine the time offset. In this way, node 510 determines anaccuracy parameter and/or a granularity parameter based at least in parton a link with child node 515, thereby enabling the application oftiming offsets to mitigate timing issues that are not rectified by theapplication of a timing advance.

It should be noted that any of the techniques described above fordetermining an accuracy parameter can be used to determine a granularityparameter, and that any of the techniques described above fordetermining a granularity parameter can be used to determine an accuracyparameter.

As indicated above, FIG. 5 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 5.

FIG. 6 is a diagram illustrating an example process 600 performed, forexample, by a node, in accordance with various aspects of the presentdisclosure. Example process 600 is an example where a node (e.g., parentnode 505, node 510, child node 515, and/or the like) performs operationsassociated with granularity and adjustment accuracy in an IAB network.

As shown in FIG. 6, in some aspects, process 600 may include receivinginformation identifying a timing advance value and a timing assistancevalue, wherein the timing assistance value is associated with aconfiguration parameter, wherein the configuration parameter comprisesat least one of a granularity parameter or an accuracy parameter (block610). For example, the node (e.g., using antenna 234, DEMOD 232, MIMOdetector 236, receive processor 238, controller/processor 240, and/orthe like) may receive information identifying a timing advance value anda timing assistance value, as described above. In some aspects, thetiming assistance value is associated with a configuration parameter. Insome aspects, the configuration parameter comprises at least one of agranularity parameter or an accuracy parameter.

As further shown in FIG. 6, in some aspects, process 600 may includeperforming a downlink transmission to a child node of the node based atleast in part on the timing advance value and the timing assistancevalue and in accordance with the configuration parameter (block 620).For example, the node (e.g., using controller/processor 240, transmitprocessor 220, TX MIMO processor 230, MOD 232, antenna 234, and/or thelike) may perform a downlink transmission to a child node of the nodebased at least in part on the timing advance value and the timingassistance value and in accordance with the configuration parameter, asdescribed above.

Process 600 may include additional aspects, such as any singleimplementation or any combination of aspects described below and/or inconnection with one or more other processes described elsewhere herein.

In a first aspect, a combination of the timing advance value and thetiming assistance value identifies a time offset between a downlinkreception timing of the node and a downlink transmission timing of thenode.

In a second aspect, alone or in combination with the first aspect, thedownlink reception timing is a time when the node receives a signal froma parent node of the node, wherein the downlink transmission timing is atime when the node transmits a corresponding signal to the child node.

In a third aspect, alone or in combination with the first aspect and/orthe second aspect, the node may determine the accuracy parameter beforeperforming the downlink transmission.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the accuracy parameter comprises anadjustment accuracy parameter.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the accuracy parameter comprises a transmissiontiming accuracy parameter.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the configuration parameter is based at least inpart on a subcarrier spacing of a synchronization signal block receivedby the node and a subcarrier spacing over a communication link betweenthe node and the child node.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the configuration parameter is based atleast in part on a bandwidth of a bandwidth part between the node andthe child node.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the node may determine the granularityparameter before performing the downlink transmission.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the configuration parameter is based at least inpart on a subcarrier spacing of a communication link between the nodeand the child node.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the node may transmit, to a parent node fromwhich the timing advance value and the timing assistance value arereceived, information identifying the subcarrier spacing of thecommunication link between the node and the child node.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the accuracy parameter is based at least inpart on a frequency band of a communication link between the node andthe child node.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, when a communication link between thenode and the child node is associated with multiple bandwidth parts, theconfiguration parameter is based at least in part on a maximumsubcarrier spacing of the communication link between the node and thechild node.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, the configuration parameter is rounded toa nearest permissible granular value of the node based at least in parton a determination that the node uses a lower subcarrier spacing thanthe maximum subcarrier spacing.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the configuration parameter is basedat least in part on a subcarrier spacing and a frequency band of acommunication link between the node and the child node based at least inpart on information specifying the configuration parameter not beingreceived from a central unit.

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, the configuration parameter isspecified by information received from a central unit.

In a sixteenth aspect, alone or in combination with one or more of thefirst through fifteenth aspects, the configuration parameter comprisesthe granularity parameter, and the granularity parameter is based atleast in part on a frequency band of a communication link between thenode and the child node.

In a seventeenth aspect, alone or in combination with one or more of thefirst through sixteenth aspects, the node and the child node areassociated with an integrated access and backhaul (IAB) deployment.

Although FIG. 6 shows example blocks of process 600, in some aspects,process 600 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 6.Additionally, or alternatively, two or more of the blocks of process 600may be performed in parallel.

FIG. 7 is a diagram illustrating an example process 700 performed, forexample, by a parent node of an IAB deployment, in accordance withvarious aspects of the present disclosure. Example process 700 is anexample where a parent node (e.g., parent node 505 and/or the like)performs operations associated with granularity and adjustment accuracyin an IAB network.

As shown in FIG. 7, in some aspects, process 700 may include determininga configuration parameter for a timing assistance value, wherein theconfiguration parameter comprises a granularity parameter (block 710).For example, the parent node (e.g., using controller/processor 240,transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234,and/or the like) may determine a configuration parameter for a timingassistance value. The configuration parameter may include at least oneof a granularity parameter or an accuracy parameter.

As further shown in FIG. 7, in some aspects, process 700 may includetransmitting, to a node, information identifying the timing assistancevalue based at least in part on the configuration parameter (block 720).For example, the parent node (e.g., using controller/processor 240,transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234,and/or the like) may transmit to a node (e.g., node 510 and/or thelike), information identifying the timing assistance value based atleast in part on the configuration parameter, as described above. Forexample, the timing assistance value may have a bit value that isgenerated based at least in part on the configuration parameter so thata recipient can determine the timing assistance value in accordance withthe configuration parameter.

Process 700 may include additional aspects, such as any singleimplementation or any combination of aspects described below and/or inconnection with one or more other processes described elsewhere herein.

In a first aspect, the parent node may receive, from the node,information regarding a communication link between the node and a childnode of the node, wherein the determination of the configurationparameter is based at least in part on the information regarding thecommunication link.

In a second aspect, alone or in combination with the first aspect,process 700 includes transmitting, to the node, information identifyinga timing advance value.

In a third aspect, alone or in combination with one or more of the firstand second aspects, a combination of the timing advance value and thetiming assistance value identifies a time offset between a downlinkreception timing of the node and a downlink transmission timing of thenode.

In a fourth aspect, alone or in combination with one or more of thefirst and third aspects, the downlink reception timing is a time whenthe node receives a signal from the parent node of the node, and thedownlink transmission timing is a time when the node transmits acorresponding to the child node.

In a fifth aspect, alone or in combination with one or more of the firstand fourth aspects, the parent node and the node are associated with anintegrated access and backhaul (IAB) deployment.

Process 700 may include one or more of the first through seventeenthaspects of process 600.

Although FIG. 7 shows example blocks of process 700, in some aspects,process 700 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 7.Additionally, or alternatively, two or more of the blocks of process 700may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

Some aspects are described herein in connection with thresholds. As usedherein, satisfying a threshold may refer to a value being greater thanthe threshold, greater than or equal to the threshold, less than thethreshold, less than or equal to the threshold, equal to the threshold,not equal to the threshold, and/or the like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by anode, comprising: transmitting information regarding a communicationlink between the node and a child node of the node, wherein theinformation regarding the communication link identifies at least one of:a subcarrier spacing of the communication link, a bandwidth of abandwidth part of the communication link, or a frequency range of thecommunication link; receiving information identifying a timing advancevalue and a timing assistance value, wherein the timing assistance valueis associated with a configuration parameter, wherein the configurationparameter comprises at least one of a granularity parameter or anaccuracy parameter, and wherein the configuration parameter is based atleast in part on the information regarding the communication link; andperforming a downlink transmission to the child node based at least inpart on the timing advance value and the timing assistance value and inaccordance with the configuration parameter.
 2. The method of claim 1,wherein the configuration parameter comprises the granularity parameter,and wherein the granularity parameter is based at least in part on afrequency band of the communication link.
 3. The method of claim 1,wherein a combination of the timing advance value and the timingassistance value identifies a time offset between a downlink receptiontiming of the node and a downlink transmission timing of the node. 4.The method of claim 3, wherein the downlink reception timing is a timewhen the node receives a signal from a parent node of the node, andwherein the downlink transmission timing is a time when the nodetransmits a corresponding signal to the child node.
 5. The method ofclaim 1, wherein the configuration parameter is based at least in parton the bandwidth of the bandwidth part of the communication link.
 6. Themethod of claim 1, further comprising: determining the granularityparameter before performing the downlink transmission.
 7. The method ofclaim 1, wherein the configuration parameter is based at least in parton the subcarrier spacing and a frequency band of the communication linkbased at least in part on information specifying the configurationparameter not being received from a central unit.
 8. The method of claim1, wherein the configuration parameter is specified by informationreceived from a central unit.
 9. The method of claim 1, wherein the nodeand the child node are associated with an integrated access and backhaul(IAB) deployment.
 10. A method of wireless communication performed by aparent node, comprising: receiving information regarding a communicationlink between a node and a child node of the node, wherein theinformation regarding the communication link identifies at least one of:a subcarrier spacing of the communication link, a bandwidth of abandwidth part of the communication link, or a frequency range of thecommunication link; determining a configuration parameter for a timingassistance value, wherein the determination of the configurationparameter is based at least in part on the information regarding thecommunication link, and wherein the configuration parameter comprises agranularity parameter; and transmitting, to the node, informationidentifying the timing assistance value based at least in part on theconfiguration parameter.
 11. The method of claim 10, further comprising:transmitting, to the node, information identifying a timing advancevalue.
 12. The method of claim 11, wherein a combination of the timingadvance value and the timing assistance value identifies a time offsetbetween a downlink reception timing of the node and a downlinktransmission timing of the node.
 13. The method of claim 12, wherein thedownlink reception timing is a time when the node receives a signal fromthe parent node, and wherein the downlink transmission timing is a timewhen the node transmits a corresponding signal to the child node. 14.The method of claim 10, wherein the parent node and the node areassociated with an integrated access and backhaul (IAB) deployment. 15.A node for wireless communication, comprising: a memory; and one or moreprocessors coupled to the memory, the memory and the one or moreprocessors configured to: transmit information regarding a communicationlink between the node and a child node of the node, wherein theinformation regarding the communication link identifies at least one of:a subcarrier spacing of the communication link, a bandwidth of abandwidth part of the communication link, or a frequency range of thecommunication link; receive information identifying a timing advancevalue and a timing assistance value, wherein the timing assistance valueis associated with a configuration parameter, wherein the configurationparameter comprises at least one of a granularity parameter or anaccuracy parameter, and wherein the configuration parameter is based atleast in part on the information regarding the communication link; andperform a downlink transmission to the child node of the node based atleast in part on the timing advance value and the timing assistancevalue and in accordance with the configuration parameter.
 16. The nodeof claim 15, wherein the configuration parameter comprises thegranularity parameter, and wherein the granularity parameter is based atleast in part on a frequency band of the communication link.
 17. Thenode of claim 15, wherein a combination of the timing advance value andthe timing assistance value identifies a time offset between a downlinkreception timing of the node and a downlink transmission timing of thenode.
 18. The node of claim 17, wherein the downlink reception timing isa time when the node receives a signal from a parent node of the node,and wherein the downlink transmission timing is a time when the nodetransmits a corresponding signal to the child node.
 19. The node ofclaim 15, wherein the configuration parameter is based at least in parton the bandwidth of the bandwidth part of the communication link. 20.The node of claim 15, wherein the one or more processors are furtherconfigured to: determine the granularity parameter before performing thedownlink transmission.
 21. The node of claim 15, wherein theconfiguration parameter is based at least in part on the subcarrierspacing and a frequency band of the communication link based at least inpart on information specifying the configuration parameter not beingreceived from a central unit.
 22. The node of claim 15, wherein theconfiguration parameter is specified by information received from acentral unit.
 23. The node of claim 15, wherein the node and the childnode are associated with an integrated access and backhaul (IAB)deployment.
 24. A parent node for wireless communication, comprising: amemory; and one or more processors coupled to the memory, the memory andthe one or more processors configured to: receive information regardinga communication link between a node and a child node of the node,wherein the information regarding the communication link identifies atleast one of: a subcarrier spacing of the communication link, abandwidth of a bandwidth part of the communication link, or a frequencyrange of the communication link; determine a configuration parameter fora timing assistance value, wherein the determination of theconfiguration parameter is based at least in part on the informationregarding the communication link, and wherein the configurationparameter comprises a granularity parameter; and transmit, to the node,information identifying the timing assistance value based at least inpart on the configuration parameter.
 25. The parent node of claim 24,wherein the one or more processors are further configured to: transmit,to the node, information identifying a timing advance value.
 26. Theparent node of claim 25, wherein a combination of the timing advancevalue and the timing assistance value identifies a time offset between adownlink reception timing of the node and a downlink transmission timingof the node.
 27. The parent node of claim 26, wherein the downlinkreception timing is a time when the node receives a signal from theparent node, and wherein the downlink transmission timing is a time whenthe node transmits a corresponding signal to the child node.
 28. Theparent node of claim 24, wherein the parent node and the node areassociated with an integrated access and backhaul (TAB) deployment. 29.The method of claim 1, wherein the information regarding thecommunication link identifies the frequency range of the communicationlink as one of: frequency range 1 (FR1), or frequency range 2 (FR2). 30.The method of claim 10, wherein the information regarding thecommunication link identifies the frequency range of the communicationlink as one of: frequency range 1 (FR1), or frequency range 2 (FR2). 31.The node of claim 15, wherein the information regarding thecommunication link identifies the frequency range of the communicationlink as one of: frequency range 1 (FR1), or frequency range 2 (FR2). 32.The parent node of claim 24, wherein the information regarding thecommunication link identifies the frequency range of the communicationlink as one of: frequency range 1 (FR1), or frequency range 2 (FR2).